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Literature:
 
Page number:34 
Description type:Non-original description 
Description:Amyloxenasma (Oberw.) Hjortstam & Ryvarden comb. nov.
Basionym: Xenasmatella subg. Amyloxenasma Oberw., Sydowia, Ann. Mycol. Ser. II, 19:35, 1965.
Generic type: Corticium grisellum Bourdot, Rev. Sci. Bourb. 35:17, 1922.
Generitype specimen: Neolectotype: Bourdot 7901 (PC), designated by Hjortstam & Larsson, 1987.
The lectotype designated by Liberta (1960) is destroyed by treatment of mercuric chloride.
Basidiomes resupinate, effused, thin to moderately thick, often fairly hard when dried, smooth or slightly ornamented, greyish often with bluish tint or even pale olive coloured. Hyphal system monomitic; hyphae more or less gelatinized and often with inflations, regularly with clamp connections. Cystidia absent. Basidia usually short, pleural, with four sterigmata and a basal clamp connection. Spores short-allantoid to reniform, smooth, thin-walled and amyloid.
 
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